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Synthesis and ionic conductivities of M (Mg, Ba, Zr) and Al co-doped apatite-type lanthanum germanate electrolytes for IT-SOFC

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Abstract

In this paper, the structure and ionic conductivities have been investigated for M (Mg, Ba, Zr) and Al co-doped apatite-type lanthanum germanates. La9.0.5Ge5.5Al0.5O26±δ (M = Mg, Ba and Zr) were prepared by solid state reaction. The results of XRD analysis showed that the space group is P63/m. M (Mg, Ba, Zr) substituting La site and Al substituting Ge site increased the cell volume and improved the lattice distortion of the apatite structure. In addition, M (Mg, Ba, Zr) and Al doping facilitated sintering and improved the relative density. Analysis of AC impedance spectroscopy showed that M (Mg, Ba, Zr) and Al co-doping in lanthanum germanates introduced local distortion and improved the ionic conductivities. Moreover, the thermal expansion coefficient (TEC) of La9.5M0.5Ge5.5Al0.5O26±δ (M = Mg, Ba and Zr) was improved after doping with M (Mg, Ba, Zr) and Al ions. La9.5Mg0.5Ge5.5Al0.5O26.5 sintered at 1400 °C exhibited the highest conductivity (1.26 × 10−2 S/cm, 800 °C) and improving TEC, which suggests that the (M (Mg, Ba, Zr), Al) doped apatite-type lanthanum germanate can be a potential material for the IT-SOFC electrolyte.

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Acknowledgements

I would like to thank to all those who have helped me during the writing of this paper, such as Professor Zhang Hua, Mr Li, Dr Han, and so on.

Funding

The work was supported by the support of the National Natural Science Foundation of China (No. 51402251), the Natural Science Foundation of Jiangsu Province (No. BK20150431), and a project funded by the Flagship Major Development of Jiangsu Higher Education Institutions (No. PPZY2015A025).

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Authors and Affiliations

  1. School of Materials Science and Engineering, Yancheng Institute of Technoloty, Yancheng, 224051, Jiangsu, People’s Republic of China

    Qingle Shi, Yuyan Cai, Pengde Han & Haijun Hou

  2. Yancheng Vocational Institute of Industry Technology, Yancheng, 224005, Jiangsu, People’s Republic of China

    Tianjing Li & Yao Wang

  3. College of Materials Science and Engineering, Nanjing Tech University, Nanjing, 210009, Jiangsu, People’s Republic of China

    Hua Zhang

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  1. Qingle Shi
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  2. Tianjing Li
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Correspondence to Qingle Shi or Hua Zhang.

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Shi, Q., Li, T., Cai, Y. et al. Synthesis and ionic conductivities of M (Mg, Ba, Zr) and Al co-doped apatite-type lanthanum germanate electrolytes for IT-SOFC. J Mater Sci: Mater Electron 29, 2725–2732 (2018). https://doi.org/10.1007/s10854-017-8199-1

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  • DOI: https://doi.org/10.1007/s10854-017-8199-1

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